Which of the following represents a correct proportion?

By Selling 90 pens for Rs. 80 a man loses 20%. What should be the selling price (in Rs.) of 90 pens for 20% profit?

A man gain 15% by selling a calculator for a certain price. If he sells it at the triple price, then what will be the profit percentage?

How many number are there from 700 to 950 (Including both) which are neither divisible by 3 nor by 7?

If 27 people, working 8 hours a day, can complete a task in 12 days, then in how many days will 18 people finish the task, working 9 hours a day?

Which of the following values suits for A to make the equation  $$ {{ATan62°Sec 28°Cot 38°}\over {Cosec62°Tan11°}}=1$$ ?

If A's capital is equal to three times of B's capital and if B's capital is equal to four times of C's capital, then the ratio of their capitals is

If A and B are acute angles and Sec A =3; Cot B=4, then the value of $$ {Cosec^{2}A}+Sin^{2}B\over {Cot^{2}A+Sec^{2}B}$$ is: